Torment where sick person is confined — not good (7)
I believe the answer is:
bedevil
'torment' is the definition.
(synonyms)
'where sick person is confined not good' is the wordplay.
'where sick person is confined' becomes 'bed'.
'not good' becomes 'evil' ('evil' is the opposite to 'good').
'bed'+'evil'='BEDEVIL'
(Other definitions for bedevil that I've seen before include "Throw into confusion" , "torment" , "Torture" , "Cause continual difficulties" , "Bug" .)